Here I want to share a Low Power Audio Amplifier circuit built with LM386 IC which you can connect to a PC or mobile phone using 3.5mm headphone jack. The low power LM386 audio amplifier was tested on breadboard. Circuit Diagram/Schematic If you want you can add a LED indicator. Just use…
Here I want to share a Low Power Audio Amplifier circuit built with LM386 IC which you can connect to a PC or mobile phone using 3.5mm headphone jack. The low power LM386 audio amplifier was tested on breadboard. Circuit Diagram/Schematic If you wa…
Previously PIR based alram circuit was demonstrated. Here a simple IR sensor-based alarm system built using an IR sensor module, two BC547 NPN transistors, a 1 kilo-ohm resistor, and an active buzzer is illustrated. The IR sensor module is powered …
I saw a circuit that showed how simple it is to make PIR based alarm system. I build and tested Arduino and PIR based alert system but not without Arduino. So this PIR alarm circuit does not need any microcontroller like Arduino. The circuit diag…
This alarm system utilizes a PIR sensor (Passive Infrared) to detect motion and a 2N2222 NPN transistor to drive an active buzzer. The 7.4V Li-ion battery provides power to both the sensor and the load. 1. Circuit Components • PIR S…
Recently, I had the opportunity to assemble and drive my very first Arduino-powered Bluetooth-controlled RC car. Creating my own wireless RC car has been a personal goal for a long time. I’ve written multiple tutorials covering the core technologies…
Emitter modulator is one of many ways you can construct a modulator. It is classified as an active modulator because a BJT transistor is used in its construction. Passive modulators uses diodes for its operation. Here an emitter modulator design is …
A Practical Guide from Basics to Real-World Design Wireless Power Transfer (WPT) is no longer limited to smartphone chargers. Today it is used in electric vehicles, medical implants, IoT sensors, robotics, and industrial systems . However, designing…
I salvaged some SBL3040 schottky barrier rectifier diodes from my old desktop power supply. These can be useful in diy switch mode power supply circuits such as DC to DC converters, that is boost converter, buck converter. They can also used used a…
Here’s a clear, practical guide to connect a USB–TTL converterwith a Bluetooth HC-05 module for configuration and testing. This is the most common setup used before connecting HC-05 to Arduino or ESP boards. 1. Know the HC-05 Pins (important) Typi…
